Rolled-steel brake shoe and process for the manufacture thereof



July 13 1926. 1,592,273

w. J. KELLY ROLLED STEEL BRAKE SHOE AND PROCESS FOR THE MANUFACTURETHEREOF Filed Dec. 26, 1924 M/ A221 r.

' so far as I am advised nopractical and shoe with the lugs fullydeformed and the PATENT OFFICE.

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Application fled December 23, 1924. Serial No. 758,292.

My invention relates to a new and im proved type of brake shoeformed ofrolled steel and to a novel process for the production of the'sa'me.

At the present time the brake shoes in:

commercial use are formed of cast iron and economical process has beendevised for the production of rolled steel brake shoes which areobviously desirable for durability and strength.

I have conceived that if a process can be devised by which the brakeshoes can be rolled cheaply, a steel brake shoe can be produced at acost which will enable it to be marketed in competition with the castiron brake shoe,-and to this end I have devised a process for therolling of the brake shoes which is based upon the novel conception ofrolling the body portion of the shoe from a narrow billet with the rollsshaped to provide upon-the back of the rolled bar a pair ofsymmetrically disposed longitudinal webs or ribs of such character thatthey can be readily sheared to provide lugs which are shaped or can bedeformed to form the retaining, the alignment, and the key lugsconstituting the present standard means for the mounting of the brakeshoes on the head.

In the practice of my process, the continuous longitudinal webs on eachbar section are cut away leaving an opposed pair of central lugs and ateach end two pairs of opposed lugs, one pair of which is adapted foroutward deflection to form the retaining lugs, while the center pair oflugs is adapted to be bent inwardly to form the key lugs. The brakeshoe, after the forming operation, is case hardened in accordance withthe best practice ,in the art and the resultant product is a. rolledbrake shoe produced economically and of maximum serviceability.

In the accompanying drawings I have illustrated the preferred embodimentof my improved type of brake shoe and have illustrated the difl'erentstages of its manufac ture.

According to the drawings Fi 1 is a perspective view of a finished rollesteel brake shoe in accordance with my invention.

Figs. 2 and 3 are side and cross sectional dividual brake shoeformedby-shea the strip to lengths and by shearing the we to form theshoulders.

Figs. 5 and 6 are. sectional views taken on the lines 5-5 and 6-6 ofFig. 4. i

; Fig. 7 is a plan view; and.

finished brake Fig. 8 is a side view of the shoe shaped to the wheelcurvature.

Similar reference numerals refer to similar parts throughout the I i Asillustrated in the drawings, the billet is rolled to produce a barhaving the section shown in Figs. 1 and 2, the steel comprismg a body 1and a pair of symmetrically disposed longitudinal vertical webs 2 and 3which extend continuously for its full length. The body 1 has a crosssection corresponding to the desired cross sectio for the brake shoe.The bar as thus produced is sheared transverselyto the lengths shown inFig. 4 and in this same operation the webs are cut away so as to leave apair of opposed center lugs 5 and at each end two pairs of opposedsimilar lugs 6 and 7 The lugs 5 and 6 have the full height of the webbut the lugs 7 are shorter and these latter lugs form the alignment lugsof the finished brake shoe 8 and are not treated after the shearingoperation. In the succeedin operation the body ortion of the sheare barsection is shape to the desired wheel curvature, the end lugs 6 aredeflected outwardly to form the retaining lugs and the center lugs 5 attheir upper ends are bent over inwardly at 9 to form the key In all asshown more clearly in Fig. 1. Thefii rake shoe 8 after being thus formedis ready for.

the hardening process, and after being hardened is ready for service.

From the foregoing it is obvious that the desired section can be rolledin one operation, that the rolled bar and its webs can be sheared in asecond operation, and that the bar can be shaped and its lugs deformedin a third operatlon, thus reducing to a m1 n1- mum the operationsrequired for the formation of a rolled steel brake shoe.

I claim as the di my invention the fact th t the section is rolled withthe webs on the back from which the lugs can be provided in a singleshearing operation.

Though I have described with great partlcularitw the details of theembodiment of the invention herein shown, it is not to be construed thatI am limited thereto, as changes in arrangement and substitution ofequivalents may be made by those skilled in the art without departingfrom the invention as defined in the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters-Patent, is:

1. A rolled steel brake shoe of the character described, comprising asection of a rolled bar having the transverse cross sec tion of a brakeshoe and having rolled integral webs projecting from its convex surfaceand disposed in opposite pairs and deformed to form key and retaininglugs.

2. A rolled steel brake shoe of the character described, comprising asection of rolled bar having the transverse cross section of a brakeshoe and having rolled integral webs on its convex surface disposed anddeformed to provide mounting elements for the shoe.

3. A rolled steel brake shoe of the char-acter described, comprising asection of rolled bar having the transverse cross section of a brakeshoe and having rolled integral webs on its convex surface disposed anddeformed to provide all of the mounting elements for the shoe.

4. A rolled steel brake shoe of the character described, comprising asection of a rolled bar having the transverse cross section of a brakeshoe, and having rolled integral longitudinally disposed webs on itsconvex surface disposed in opposite pairs imd deformed to form key andretaining ugs.

5. A rolled steel brake shoe in accordance with claim 4, which has ateach end in addition to the deformed webs, non-deformed rolled websforming alignment lugs.

6. A rolled steel brake shoe of the character described, comprising arolled steel bar section curved to correspond to the wheel curvature andhaving on its convex face integral rolled webs formin at each end twopairs of opposite lugs of different heights, the outer lugs beingoutwardly deformed to form retaining lugs, and having a pair of rolledcenter webs which are inwardly deformed to form a key lug, substantiallyas described.

7. A rolled steel brake shoe of the character described, comprising arolled steel body formed integrally with five pairs of lugs on itsconvex surface, said lugs being arranged in parallel longitudinalvertical planes equi-distant from the longitudinal center line of theshoe and formed-from upright rolled webs, the end lugs being outwardlydeformed to form retaining lugs, the inner adjacent end lugs beingshaped and disposed to' form alignment lugs, and the center lugs havingtheir tops bent inwardly towards each other and shaped to form a keylug.

In testimony whereof I afiix my signature.

WALTER J. KELLY.

